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ECU Check - where and how-to?

ECU diagnostic tool how-to

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#1 Kanye9



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Posted 21 February 2017 - 05:25 AM

<p>Hi Starquest fans,

I need YOUR help &#55357;&#56861;
Let me explain -

Global issue is - car doesn't run as expected -

1. Start engine
2. Push gas, all fine and reaches 5k rpm without problems
3. Back to idle
4. Push gas and you can see that it becomes difficult to go over 2k rpm

Observations: the problem seems to begin when turbo starts to deliver power ( i.e when charged and start)

THEN if we stop engine
It goes like 1.
Then again the same scenario over and over.

2.0 1982

checked and cleaned tank

Replaced all filter

Not yet done

check electric cables to injectors

check injectors

check ECU (Because I dont know what, where and how-to)

Thanks for helping me !

Edited by Kanye9, 21 February 2017 - 05:28 AM.

#2 importwarrior


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Posted 21 February 2017 - 05:49 AM

usually when i see this it seems the injector ( Secondary injector ) works for a short time then just dies out.
replace secondary injector if you have one and try again.

i had a 9 volt battery and hooked the injector to it with a button switch. when i repeatedly turned on and off you could hear and feel the clicking was good for the first 10 cycles and then it slowly got worse and eventually didn't click open any more. it seems it is just worn out internally.

B-71 87 TSI ~ RIP

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#3 Kanye9



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Posted 21 February 2017 - 06:05 AM

First,thanks for your fast reply

Attention point!
my starion is a 2.0 and then doesnt have 4 injectors.

And don't have any injector right here :/

So, as solution, replace the ECU? :o

Edited by Kanye9, 21 February 2017 - 06:06 AM.

#4 scott87star


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Posted 21 February 2017 - 10:07 AM

It's not the ECU, they hardly ever go bad.
Now selling true plug and play megasquirt!  Absolutely the best value in stand alone ECU's out there.

I can upgrade your Fuel Injection Pro firmware

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Now a graduate of EFI University!  www.efi101.com

ECU Vendor link:  http://www.starquest...howtopic=137426

#5 ucw458


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Posted 21 February 2017 - 01:17 PM

Regardless of engine or year, no SQ came with 4 injectors.  83-86 have 2 injectors the same size that spray at the same time.  87-89 has a primary and secondary injector.  They are different flow rates.  The bigger secondary comes on around when the turbo makes boost.  If that one may be faulty.  I would suggest replacing the injector electrical connector first.  It's a bosch EV1 style connector.  Polarity doesn't matter.

Also check the vacuum advance inside the distributor.
My 87
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#6 markhansenconquest


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Posted 21 February 2017 - 04:29 PM

Did u clean the screens in the top hat?

#7 Kanye9



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Posted 22 February 2017 - 03:43 AM

Thanks for your answers,y're awesome ;)

I already check the vacuum but will check/replace the connector to injector.


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